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|Title:||Online-growth measurements on the generation of metal nanoaerosol and their offline structural properties|
Mehta, B R
Kruis, F E
|Abstract:||Aerosol, which is intentionally generated in the laboratory, is utilized to synthesize nanoparticles. As the size of suspended nanoparticles in nano regime, therefore, purposely generated aerosol is termed as nanoaerosol. The present study demonstrates the formation metal nanoparticles in gas-phase. For this purpose, the initial condition; is to create nanoaerosol that is, suspension of tiny metal particles in gas. By evaporating a metal source in the presence of gas, creates the condition of supersaturation and then by nucleation and condensation forms stable nuclei, which grow in size to form primary particles in gas. A high-temperature furnace is utilized to evaporate metal e.g. palladium with 10% silver (PdAg), in the high purity nitrogen, is known as a carrier gas. During the sparking process, growth of the PdAg nanoaerosol is monitored online by a scanning mobility particle sizer, as a function of different parameters. Size-distribution in produced nanoaerosol shifts towards larger mobility equivalent diameter value from 7.83 to 42.6 nm along-with the increase in number concentration, on increasing the evaporation temperature from 1200 to 1400 °C. To study the effect of sintering temperature on particle size, size-fractionation by a differential mobility analyzer and in-flight sintering of PdAg nanoaerosol have been carried out. On increasing the sintering temperature, the size of selected PdAg nanoparticles reduces. The geometric mean mobility equivalent diameters of fractionated PdAg nanoparticles of 17.9, 25.3 and 30.9 nm reduces to 15.2, 19.4 and 21.7 nm, respectively, due to the compaction. The value of geometric standard deviation is approximately 1.10, which reflects the monodisperse nature of PdAg nanoparticles in the generated nanoaerosol. An electrostatic precipitation technique is utilized to separate out PdAg nanoparticles from nanoaerosol onto suitable substrates. Formation of spherical and mono-crystalline PdAg nanoparticles is revealed by TEM studies.|
|Appears in Collections:||AIR Vol.02(1) [March 2020]|
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